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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7c0c84e9f116421f8c931fabf575fe4b3de302690c477c10126df96debd4f8' 
  AND token = 'NTVBFYGa5az3h9ut1rnGnAPg/w+/P0nLS4Bdca4h2Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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