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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17fd91165d9cea8ab3f0ac5a62705af3dd572925033ce8aa3b7cb683102f2d30' 
  AND token = 'LLHYzVuN0zEz0zYooW8RjJtRKQ5UgitrJoz9qse6b3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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