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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07eb57b3d04c61c962acb2655462d8e41d4f3c5a29c0f83316e2e4d3d0b0327b' 
  AND token = '10Fda58BdLZoZOcMnHsuopOdesO8cPHhht0GpL4jz3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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