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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c246b08618ecdad5e7d434dca3d11d752b2f3cc65b1f04b450b7bfd9d45c0549' 
  AND token = 'AptnJjptW/nCsCIcMClRsReQMnzMlZHjoK3J+FPoMew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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