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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68800ebee287f0cc6f7785e7f000e31b73e4931df71cf45fb4bd2951a0df3e8' 
  AND token = 'yGYwSRgYvHQgpWydowksu9iA04CadkqIDrSeQpx7IdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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