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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db8ebf0134e0fe1cacc321a5cb45da0bf745cab80d56675eaf7765a7a5d42b2' 
  AND token = 'uQ0TybYYrQK4fiwssBszA6C+5AqTCU183P9hhnUjcs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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