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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a6a72f1d88e15e1b8095b02430a1ed19f0f54bca3194a747969cc71d31a6e5' 
  AND token = 'MNIVIssMk/8wvzVGuXb8/S3nxN08vhMwInplrG74zRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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