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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed8c35937c0589896d04f5b995720c66f8570b119afcd31d518ac14bfd6c08a' 
  AND token = 'QnkQZtXQL9ynACsmhRsm53BzChu8yg2ltAM7vPmHH50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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