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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3a63d2c582a60621c914b25a17937c4385d5c44449c44739b82f64b42174c5' 
  AND token = '35XBULYbD5hsU2tRQLmVfFsxNI90zDLIHt4UfRALBDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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