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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60c21692e581f3ed94aaf82cc7d6217ebcfea55068ed1abcd54ec48b8cd9511' 
  AND token = 'VzhH5WGIX0tdm6Y+894FHt9EdsllPCmgi+Zx6AGSdeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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