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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f330be85b1dcf615607c128543b75ea094786e13483a621e9b8ada9788d1f55' 
  AND token = 'dfNGbM4kZBSd/b3bKNviFGHF1VJfM6I1E1D9iISWJxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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