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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '858d1982ce3c70530c9538c85ea7a939cc680a99d6fba26b28e85e1eb83262c8' 
  AND token = 'mMnK3gRNNMKnrfN4dYR9k6MlCR7waSgoq3o19eguhB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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