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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa13b57c606170be5695c76baeacef161fe2393195f148bd9ad36c736e6593da' 
  AND token = 'pMW7I6DgxW+ebomIg002tL0WJmKeKgpQvPOK4T82gSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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