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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c18264a4e1bee0f5f26cb8dbeab5bd71ac8dccc1b724f28bbcca01738f0195' 
  AND token = 'Fjd2ajDc39U/m9hz1xCHmWmIy0/SWbHde1W0JMg0Srg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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