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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c1ec9beaaa7794e58c9e7da589304da66b1e6a9408b0cc5bc7456e21927ba3' 
  AND token = 'RQZfVbR0fqlSmlPkX2m3+HPzNdKoWzN4doySnzUIv+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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