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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac7e2a10ea190399fbc97c65a8a69b07a9be743b975e8ee08bdaf29b4e77990' 
  AND token = 'WcERqrqn3SSzYXGtOb2pTkvO+Mg7M0G8LCGcPWMHNfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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