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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a3e1f16361f94f9d62142c050012541cf5c58b8086b2c481a40ece53d9993e' 
  AND token = 'A9fEJllSU2JmcjsrmHCRodDz8RbCJiLEdWKuRJxgYIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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