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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7aef5c14a16fe85569fd2e86ba71c823a217d4602d08d5f9b00429cf28e917f' 
  AND token = 'IqIeKuRcCGrq09Ay24Pfsa9q6akDUUQVQYSg/JacwVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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