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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087fcfeb9ebcce25b3909415679bf95d8b3a861d75b5412053064825d3813805' 
  AND token = 'lLxOKNsyFnanmAn8FQD72e91a+BxyLIANmIt6+T3hNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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