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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fded495b0f2d6dd3c3870bd41d95a81b23c09ce3a6b2d3f904950a680b53d80c' 
  AND token = 'AltSfCZacTR9hZycx+NNPcPmPL3YrLdgEdX9TgWcNHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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