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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4904c3f634189bf4a46c899d08b93ec23ebcff7a64ca14fd47522ad5426c255c' 
  AND token = '9Y0ZQ3w6bHr7iS9Z4bMDifRmrSAZSPX45Bb0FVrO8nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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