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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929674ecb1497b9184bd873fb87e8d8daf2fc3f3cd6d77949eb3651b45985cb8' 
  AND token = 'u1gB8emK7uyTytO1bA6dyxK8sAut+kT6FBSmjIrCs4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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