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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb54c1684a1ad9cf516cda8bd73f2f800cf855e65264b6f5b86f86706485167' 
  AND token = 'YRGLP3JM87AO8BDtULxcjx355w9r9Xo91gRykJYaFFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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