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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7497f4ab5163b19ebc87de421b2b2886706982f0abe471fd561ce2d61a703c4f' 
  AND token = 'DWGZ4F6/KVSOI7Cfhwk46Fsw3y+4keQtAMczD0OFkEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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