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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733f0ec162c1a5be07e634b8b862568edeebb7d000a188052fdd880452fda1ef' 
  AND token = 's18xHJR3boUfrjMh7Fem7KJNfIy9a6iZNd2EBJhe+zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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