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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02d82525ec5535da33ac4b6ba1a3f2f0a9f30141953fec6f698c2e574177074' 
  AND token = 'UY3atnLGPyQw4169q2yUw/Nrl1l6zfnvpRmcTQlUbDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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