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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c4dc0e047a17163f71f480dcfdc974ee386cba1d7e6420a3b50b4b39165fb2' 
  AND token = '9sc+8paUvBi479mBCIGE1vEBnBP5RiWx75UN9nCok3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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