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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c8fc4a22fbf3dd503848cb986415e62e196c855bfb39484fe27836c2aab9461' 
  AND token = 'FHWqt9fgXhWNfIndwk+nWWlW7f5yRj2YBUjfPC6a0g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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