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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4392c26c687360257b5c32b0b2098bf929e2f2e129d4fb8a610c3ddddb758f99' 
  AND token = '/IvoXSIZhaCkZH5aiNCpE17ZyXUjUI2Nk+p4KEvEErA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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