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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd7b8ea661e3edd784ce03e7a721cf1877e0cdb04af95e824510b46ba69106e' 
  AND token = 'BZqnsoGRpJAiq16tUNfexICPhX1X0nf76oipPytMjPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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