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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6254b4799775321da6894f1f91506f054ab300b83f062b942d0359e35b20d06' 
  AND token = 'wGdeqF2wuFBJfbNE4bKqJltTrAQE52S816llA6UlvHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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