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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aef46dab698c5afa4c5e2b2cfbbd694a3509ad9c540a10a3d356b34593919d4' 
  AND token = '4jN3EU8j3xDXMzhWTowdhtWYEVSqXC6w5rgEabvMt8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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