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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0705cfd7dacb745b1998f360759da062fb95c2f8a4a790e97ad9f0742fd9ba' 
  AND token = 'je820nGSuoHy+uhH2YkbaKElg4GjwX+gne/vjLn1pok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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