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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb0a6e753e8de4feb7d2fbdfc0de146539475f81b32384488b1d47ee8379c62' 
  AND token = 'poRHCJsdgNhOz/978ua3nyB1UzTFGM8HPXF3i1drAgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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