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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ee602700b90bf75f09ba7ee556143071c326629ef27a4fc2d3f352f8af03a1' 
  AND token = 'zIv39ORCDab9TRKPc33I2X2+vpt7ATlnM1FqRz3xU0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}