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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc13e73348cc5c37ecd2c9da556014b1528c9b97cb200e5cf29962a4bdd1e78' 
  AND token = 'LsXprq5jFxQM3tbuhqdvZZwstHhpc4pYqSOoS/302yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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