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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b25c794810c37ebf46e2c2afc3253d2d0f318e7f3d96decc4068b3cfcb67264' 
  AND token = '+5gKOUb6qiMzViVVDPnFOh0P5kWxSs19mDcQLqsot+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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