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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aacab582a81b457b3207b34a3b9a50d97db4618029d9dd376201d5b1f0a2606' 
  AND token = 'Mg+0VYdwVIuAFDiYRrxC4+izW9bg8khdLvoOtN5xN94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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