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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8516ab826e2b4475f5aa9911dd299ae2b846f0282a27611131ef9e8c89375b1' 
  AND token = 'fVBAKp4xEOcGrAdLVdae4Tiiu2viKQMCht9QJz9Uv1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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