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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e7c57a0cd336528540bc02169eecd0f26f0e82ce132473dd258824a5f6fead' 
  AND token = 'Ikj2lPUr86S4YOiG+1v4N8aqJfqh+sRFsy+GMgaFjJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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