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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceba0f957507b67a3c6ba6220b9c952e9b49d889374fd22d9cd9e90721e3d5c8' 
  AND token = 'ea8Xl7cN342FcgS4eWYHY7ILDJUtep8suZHF66rwphI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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